With New Relics Real User Monitoring, Application Performance monitoring and ServerMonitoring, New Relic has you covered. Everything you need to know about your application is there. And if you deploy New Relic right now, you'll get a free copy of Eric Ries' "the Lean Startup".

Build-Measure-Learn is a key concept of the lean startup, and NewRelic makes that measuring easy

Whether you agree with the Rails core team or not, last week's high profile mass assignment problem wasn't a security flaw in Rails - it was operating as designed. If you didn't realize that, you might be vulnerable to the same problem. the Rails Best Practices gem has been updated to flag this issue for you in your own code.

And if you don't agree with the Rails core team on this issue, or if you want something stronger than an after-the-fact code checker to ensure you're not mass-assignment vulnerable, check out the mass assignment guard gem by Zubin Henner

Mike Pack wrote in to tell us about his article "Flexible Searching with Solr and Sunspot". The article is a clear introduction of Solr and how it fits in your application's architecture, and how to use sunspot - a DSL for describing how you want your model data interacting with Solr.

In this episode we do the robo boogie all while discussing REE end of life, preparing your app for Rails 4 & Ruby 1.9, Ruby ORM Initialization slowness, Mutation, spell checking in View Tests, and the release of Rails Testing for Zombies.